letter_list='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
def Get_KeyList(key):
    key_list=[]
    for ch in key:
        key_list.append(ord(ch.upper())-65)
    return key_list

def Decrypt(ciphertext,key_list):
    plaintext=""
    i=0
    for ch in ciphertext:
        if ch.isalpha():
            if ch.isupper():
                plaintext+=letter_list[(ord(ch)-65-key_list[i]) % 26]
                i+=1
            else:
                plaintext+=letter_list[(ord(ch)-97-key_list[i]) % 26].lower()
                i+=1
        else:
            plaintext+=ch
    return plaintext
print(Decrypt("ohtnw,zuurl",[7,3,8,2,8,3,6,3,6,8]))